Cosmic Queries – Your God Is Too Small

What It Covers

Neil deGrasse Tyson and Chuck Nice answer listener questions about photon behavior in optical media, LIGO's gravitational wave detection using perpendicular lasers, quantum entanglement limitations for faster-than-light communication, relativity paradoxes in cosmic voids, and speculative evolution scenarios where rodents could dominate Earth after human extinction, reaching human-sized proportions without predators.

Key Questions Answered

• •Light Speed in Media: Photons maintain light speed between molecules but slow when absorbed and re-emitted by atoms in transparent materials. Diamond's refractive index of 2.4 reduces light speed to 40% of vacuum speed. This molecular interaction creates measurable delays that enable lens design and optical engineering applications across microscopy and telecommunications.
• •LIGO Detection Method: Gravitational wave observatories use two perpendicular laser paths at right angles to detect spacetime distortion. When a gravitational wave passes, it stretches space in one direction while compressing the perpendicular direction. Comparing these two independent measurements prevents false readings that would occur if only one laser path existed, solving the reference frame problem.
• •Quantum Entanglement Limits: Entangled particles cannot transmit new information faster than light because their correlated states are predetermined at creation. While measuring one particle instantly reveals the other's state, no mechanism exists to encode messages after entanglement occurs. This fundamental limitation prevents quantum entanglement from enabling faster-than-light communication despite instantaneous correlation.
• •Total Internal Reflection: Light bends when crossing media boundaries with different refractive indices. At steep angles, light never enters the second medium and reflects entirely back into the original material. This phenomenon enables fiber optic cables and optical microscopy. Anti-reflective coatings use half-wavelength layers to create destructive interference, eliminating surface reflections in multi-lens camera systems.
• •Post-Human Evolution: Rodents represent the most successful mammalian branch with numerous species adapted to diverse environments. Their current size limitation stems from needing escape holes from human predators. Without humans, rodents could evolve to human-sized proportions, similar to how capybaras became the largest living rodents. Mammals occupy every size range from shrew to blue whale, demonstrating adaptive capacity.